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RE: st: GLLAMM


From   "Howard B. Degenholtz" <degen+@pitt.edu>
To   statalist@hsphsun2.harvard.edu
Subject   RE: st: GLLAMM
Date   Thu, 08 May 2003 09:59:24 -0400

Sophia,

Thank you for your reply.  Do you know of any examples of a 3 parameter IRT
model using GLLAMM?

Thank you again,
Howard

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of
S.Rabe-Hesketh@iop.kcl.ac.uk
Sent: Monday, May 05, 2003 12:32 PM
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: GLLAMM


Howard,

Yes, it is.

You first have to use gllamm
to evaluate the likelihood for your data
using the published parameters
(use the 'from()' and 'eval' options).
Then you can use the 'predict' command to
obtain the scores (values of theta) for
the units.

The first step (evaluation of the likelihood)
is necessary so that the predict command
understands what model the predictions should
be based on.

Best regards,

Sophia


I am interested in using GLLAMM to analyze data from an IRT model.  Is it
possible to input publish parameters and calculate theta using GLLAMM?

Thank you in advance,
Howard

Howard B. Degenholtz, PhD

Associate Director of Research,
Center for Bioethics and Health Law
Assistant Professor,
Department of Health Policy and Management
Graduate School of Public Health
University of Pittsburgh
3708 5th Ave. Suite 300
Pittsburgh, PA 15213

Voice: (412) 647-5860
Fax: (412) 647-5877
Email: degen@pitt.edu



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